Asbestos gallery: Asbestos boards


Asbestos Insulating Board


Used for fire protection, thermal and acoustic insulation, resistance to moisture movement, and general building board. Found in service ducts, firebreaks, infill panels, partitions and ceilings (including ceiling tiles), roof underlay, wall linings, external canopies and porch linings.

Asbestos content and type / date last used:

Crocidolite (blue) asbestos was used for some boards up to 1965. Amosite (brown) asbestos was used up to 1980, when manufacture stopped.

Usually 15-25% amosite (brown) asbestos, or a mixture of amosite and chrysotile (white) asbestos in calcium silicate. Older boards – and some marine boards – may contain up to 40% asbestos.

Ease of fibre release:

Asbestos insulating board can be easily broken, leading to significant fibre release. Significant surface release is also possible by abrasion, but the surface is usually painted or plastered. Sawing and drilling will also lead to significant releases.


Asbestolux, Turnasbestos, LDR, asbestos wallboard, insulation board, marine board, Marinite and Shipboard.

Asbestos Mill Board (‘Millboard’)


Millboard was used for general heat insulation and fire protection. It was also used for insulation of electrical equipment and plant.

Asbestos content and type / date last used:

Crocidolite (blue) asbestos was used in some millboard manufacture between 1896-1965, usually chrysotile (white) asbestos. Millboards may contain 37%-97% asbestos, with a matrix of clay and starch.

Ease of fibre release and product names:

Asbestos ‘Millboard’ has a high asbestos content and low density, so it is quite easy to break the surface – and it is subject to abrasion and wear.

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